Package Includes:1×Fixed Bracket 7×Square Hole Drill BitsOur square hole drill bit adapter and drill bit set is used for drilling mortises and tenons. It is easy to install and use, reliable and practical. It can reduce workload and suitable for beginners and workers.Features:✅Square Hole Drill SleeveThe force of the drill sleeve blade is effectively protected on a flat surface, which can avoid bursting at the beginning.✅Alloy Drill BitThe drill bit is forged from alloy and has high overall heat treatment hardness.✅U-Shaped Chip Discharge ChuteThe U-shaped chip discharge chute facilitates the discharge of wood chips and improves the drilling rate.✅Universal Round HandleMore stable clamping, suitable for square hole machines, square tenon machines, hand electric drills, etc.Specification:Product Name: Square Hole Drill Bit AdapterMaterial: Bracket: Carbon Steel Drill Bit: CarbideSpecifications: 6.4/8/9.5/12.7/14/16/19mmShank diameter: 19mmColor: Silver GreyNotes:1.It is only suitable for bench drills and hand drills with clamps.2.There may be slight differences between the picture and the actual color of the commodity. We will try our best to show you the exact color.3.Please allow slight dimension difference due to manual measurement.