This SDS-Plus Sledge ¼-inch mortar knife is made of high-grade forged steel and has a⅜-inch drill bit. It has a 7¾-inch length, SDS Plus 13/32-inch shank, a seven-inch flute, and 5/8-inch head width. The knife features a round chisel collar and a fractional-inch measurement system. It is suitable for use with SDS-Plus rotary hammers.