uxcell 2 Pcs Diamond Drill Bits 8mm 5/16" Bottle Glass Tile Granite Hole Saw Product Name : Glass Hole Saw;Main Material : Metal Cutting Hole Diameter : 8mm/ 5/16";Shank Hole Diameter : 4mm/ 5/32" Shank Size (Approx.) : 6.5 x 20mm/ 0.25" x 0.78" (Diameter*L);Total Length : 50mm/ 2" Color : Silver Tone;Weight : 13g Package Content : 2 x Glass Hole Saw