Woodhaven 8585 2-3/4" T-Strike Plate Jig 1-1/8" x 2-3/4" T-Strike Plate Jig with 1-1/2" wide Tee Fastest, easiest, least expensive and most accurate way to cut a strike plate mortise. Clamps to work so there's no nail holes or other unsightly blemishes! Made of 10mm (.393) thick phenolic for heavy duty use, measures 3-5/8" x 5-5/8". Uses a bearing guided bit (our 8500 or 8505 - sold separetly), or bushing & bit combination (5030K & 13416 - sold separately), to follow the jig for perfect mortises. Lifetime guarantee against defects in material or workmanship. Made in the USA!