Specification: Name: square hole saw Material: high speed steelColor: as the picture shows2 sizes for your choice: 6mm/8mm/10mm/16mm Length: approx. 200mm (diameter 6mm); 200mm (diameter 8mm); 203mm (diameter 10mm); 208mm (diameter 16mm) Square hole drill can not be used on electric drill, the square hole drill must match the square hole (mortise machine and tenon) to use. Recessed and quadrangular square hole drilled through the terrible + outer sleeve in the middle of the combination. Reduce the labor intensity of construction workers, accelerate the speed of construction, reduce the construction cost for construction, installation, renovation, decoration industry. Arc-shaped, exquisite permanent sharpening. Case application: Square hole drill bit is mainly for woodworking aspects. Package Included:1 x Square Drill HoleNote:Please allow 1-2cm errors due to manual measurementItem color displayed in photos may be showing slightly different on computer monitor since self-payment monitors are not calibrated1) We accept Alipay, West Union, TT. All major credit cards are accepted through the payment processor's secure escrow.2) payment must be made within 3 days of placing the order.3) if you are unable to check out immediately after the listing ends, please wait a few minutes and try again, payments must be completed within 3 days. Shipping1.