PLEASE READ.SDS Concrete Drill Bits with Chisel Set of 12 / SDS Drill Bit Details / Drill Size: Approx. 7.1 x 17.7 x 12.2 x 8.3 inches (18 x 450 , 16 x 310 , 12 x 210 , 10 x 160 mm), Concrete Chisel Size: Approx. x250mm, Flat Chisel Size: Approx. 0.6 x 9.8 inches (15 x 250 mm), Tomo Chisel Size: Approx. 0.6 x 9.8 inches (15 x 250 mm), SDS Shape: Plus (approx. 0.4 inches (10 mm).