Red Featherboard are made of Engineering materials,each one has 13 ANGLED FINGERS that apply steady pressure that consistently produces cleaner cuts with less chance of kickback, chattering or lifting. This unique Featherboard can be quickly and easily connected to a miter slot or t-slot. 3/4-Inch and 3/8-Inch wide miter bars and t-slot bolts fit most table and band saws, router tables, and fences, split rail miter bar construction that provides maximum hold It holds hold the stock up tight against the surface of tool or fence while you run it through, a dramatic increase the accuracy,quality and safety of the cuts. The featherboards for table saw thickness is 5/8 inch. There are two bolt slots, 6 1/2" and 4 3/4". the slot width is slightly larger than 1/4 inch.