This WoodRiver® Router Jig provides a method to produce slots and keyholes for 1/4" T-bolts using a handheld plunge router with a 3/8" bushing and 1/4" straight bit (not included). This jig also has provisions for making handholes in two different styles. Injection molded from rugged ABS plastic, this jig will help you to make fixture slots with ease.