uxcell Mounted Point Grinding Stone Set Polishing Drill Bits 10 in 1 Main Material: Ceramic, Metal; Package Content: 1 x Mounted Point Stone Set Product Name: Mounted Point Stone Set Weight: 147g Main Color: Silver Tone, White, Blue, Fuchsia Shank Size: 30x3mm/1.2"x0.12"(L*D),30x6mm/1.2"x0.24"(L*D)