A beater is a weaving

Weaving

Weaving is a method of fabric production in which two distinct sets of yarns or threads are interlaced at right angles to form a fabric or cloth. The other methods are knitting, lace making and felting. The longitudinal threads are called the warp and the lateral threads are the weft or filling...

 tool

Tool

A tool is a device that can be used to produce an item or achieve a task, but that is not consumed in the process. Informally the word is also used to describe a procedure or process with a specific purpose. Tools that are used in particular fields or activities may have different designations such...

 designed to push the weft

Weft

In weaving, weft or woof is the yarn which is drawn through the warp yarns to create cloth. In North America, it is sometimes referred to as the "fill" or the "filling yarn"....

 yarn securely into place. In small hand weaving such as Inkle weaving

Inkle weaving

Inkle weaving is a type of warp-faced weaving where the shed is created by manually raising or lowering the warp yarns, some of which are held in place by fixed heddles on a loom known as an inkle loom. Inkle weaving was referred to in Shakespeare's Love's Labour's Lost. It was brought to the...

 and tablet weaving

Tablet weaving

Tablet Weaving is a weaving technique where tablets or cards are used to create the shed through which the weft is passed. The technique is limited to narrow work such as belts, straps, or garment trim....

 the beater may be combined with the shuttle

Shuttle (weaving)

A shuttle is a tool designed to neatly and compactly store weft yarn while weaving. Shuttles are thrown or passed back and forth through the shed, between the yarn threads of the warp in order to weave in the weft....

 into a single tool. In rigid heddle looms the beater is combined with the heddle

Heddle

A heddle is an integral part of a loom. Each thread in the warp passes through a heddle, which is used to separate the warp threads for the passage of the weft. The typical heddle is made of cord or wire, and is suspended on a shaft of a loom. Each heddle has an eye in the center where the warp is...

s. Beaters appear both in a hand-held form, and as an integral part of a loom

Loom

A loom is a device used to weave cloth. The basic purpose of any loom is to hold the warp threads under tension to facilitate the interweaving of the weft threads...

.

Hand beaters must have enough mass to force the weaving into place, so they come in a variety of weights and sizes. Some may have lead

Lead

Lead is a main-group element in the carbon group with the symbol Pb and atomic number 82. Lead is a soft, malleable poor metal. It is also counted as one of the heavy metals. Metallic lead has a bluish-white color after being freshly cut, but it soon tarnishes to a dull grayish color when exposed...

 inserts to provide additional heft for a smaller beater, and some are made entirely from metal.

Loom beaters typically take the form of a bar mounted across the loom. The actual beating is done by a metal insert known as a reed

Reed (weaving)

A reed is part of a loom, and resembles a comb. It is used to push the weft yarn securely into place as it is woven, separates the threads and keeps them in their positions, keeping them untangled, and guides the shuttle as it moves across the loom. It consists of a frame with lots of vertical...

, which contains a number of slots, known as dents, which the warp

Warp (weaving)

In weaving cloth, the warp is the set of lengthwise yarns that are held in tension on a frame or loom. The yarn that is inserted over-and-under the warp threads is called the weft, woof, or filler. Each individual warp thread in a fabric is called a warp end or end. Warp means "that which is thrown...

threads pass through. This is the more common form, as floor looms and mechanized looms both use a beater with a reed.