glass milling tool :1. high sharpness 2.durable glass milling toolsNameModelPictureSizeglass milling toolsS12410,15,20,25,30diamond drill 1/2 GASS1184-140mmdiamond drill taper shank S1205-140mmdiamond drill straght shank S1215-140mmcounter sink drill 1/2 GASS122o-30,0-45,0-55,0-65counter sink adaptorS123 4-140mm