The product is 1x16x21 SDS Max Bit Carbide tipped bit head is harder, tougher, and more resistant to extreme loads 1" diameter, 16" useable length, 21" overall length Four chiseling faces and cutting edges double the chiseling action for more efficient drilling The product is 1x16x21 SDS Max Bit. Easy to use. The product is manufactured in China. This Bosch 1-inch by 16-inch flute by 21-inch SDS-Max rotary hammer drill bit offers improved performance with its carbide-tipped head with 4 cutting edges. The bit is designed to help reduce vibration when drilling. The bit shaft wears at a slower rate and better withstands repeated use.