6pcs Woodworking Square Hole Drill Bit Mortising Chisel Set Mortiser Drill Bit for DIY Woodworking Tools Color: Silver And Black Slotting flute diameter Total weight(approx.): 6mm: 150g 8mm: 161g 9.5mm: 177g 12.7mm: 206g 14mm: 251g 16mm: 310g Professional wood drill bit, suitable for construction, installation, renovation, decoration industry, etc. It will get double effect by matched use with mortise and tenon machine, the square hole punching needs to use electric drill, hammer and other tools. Package Included: 6pcs * Tenon Hole Drill Bit Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.