Detailed Product Description This is Sds Plus Hammer Drill Bit Set, Features:1) Tungsten carbide tipped: YG8C2) Material: 40Cr3) Aluminum case ... 160, 10 x 160, 10 x 210, 12 x 210, 10 x 450, 12 x 450, 16 x 4504) SDS plus drill ... 20Packing:Aluminum caseIt's called SDS Plus Hammer Drill Bit Set & Makita 12 Piece SDS Bit & Chisel Set,drill bit set,sds plus set,tool set.