ITEM NAME:10pcs 3.0 cylindrical cone grinding wheel bit head hand polishing DIY OZ Features: 100% New and High Quality. This is a most commonly used Grinding Tool, which has good polishing performance. Handle Diameter: 3 mm Head size: 4mm \ 5mm \ 6mm \ 8mm \ 10mm diameter Material: Red corundum grinding wheel. Package Included: 5pcs Cylindrical Bits + 5pcs Cone Bits.5pcs Cylindrical Bits + 5pcs Cone Bits. This is a most commonly used Grinding Tool, which has good polishing performance. Material: Red corundum grinding wheel.