Apart from making it easier to drop and weigh your anchor, the pivoting dual-roller design of this anchor roller reduces friction for less strain on your windlass and/or yourself. It also helps to reduce chafe, prevents scratches and dings to your boats finish, and provides a secure place to store your anchor when used in conjunction with an optional chain stopper or tensioner. Compatible with Delta/DTX, Danforth, Fortress, CQR plow style and Claw/Bruce style anchors. Stainless steel with Delrin rollers. Installs using common tools. Installation note: overhanging anchor rollers should be supported along at least 2/3 of their length. Fasteners not included. Designed for installation with 3/8" bolts. Length: 23". Width: 3". Roller Width x Diameter: 2 1/4" x 2 3/4" (Fwd) 2 1/4" x 2 1/8" (Aft).