UPGRADED SHARP EDGE: The sharpened, flexible blade cuts under material faster and the beveled plate edge prevents material from binding up, also prevents the user from excessively leaning over, and improves user ergonomics. 4 SPARE BOLTS & LOCKNUTS: Comes with 4 spare alloy steel bolts and locknuts. The thinset removal chisel bit blade is replaceable with Firecore SDS Max floor scraper 6-inch replacement blades. This SDS max chisel bit is compatible with cordless and corded SDS max system rotary hammer drills, such as Dewalt, Bosch, Milwaukee, Makita, Hitachi, and so on. STABLE BLADE ATTACHMENT: Features locking bolt-and-nut fasteners for more secure blade attachment and better resistance to vibrating loose than non-fastener tile removal bit. Innovative tapered head design helps to prevent shearing off of the bolt heads.