Features:-Quantity: 1 pc, 4 pcs. (optional)- -Made of high-quality materials, -Square hole drill bits can not be used with electric drills, square hole s must be used with square hole drill bits (groove and spigot machine). Mortise and square hole square drilled with a terrible + outer sleeve in the middle of the combination.-Reduce the labor intensity of construction workers, speed up construction, and reduce construction costs in the construction, installation, decoration and decoration industries.-Bow pattern, excellent sharpening and durability.-Use object: square drill hole is mainly used for woodworking. Product Parameters:Name: Square Hole SawProduct Size: 1/4 inch (6.4mm), 5/16 inch (8mm), 3/8 inch (9.5mm), 1/2 inch (12.7mm)Weight (Approx.):1/4 inch (6.4mm)-110 grams5/16 inch (8mm) - 140 grams3/8 inch (9.5mm)-165 grams1/2 inch (12.7mm)-190g Package List:4*Square Hole Drill Bit Or1*1/4 inch, 5/16 inch, 3/8 inch, 1/2 inch square hole drill bitNotes:1. Due to various factors such as display brightness and light brightness, the actual color of the product may be slightly different from the picture on website.2. Please allow slight deviation between the data and manual measurement.