Features:

• Made of premium quality high speed steel with high hardness and durability, anti-rust.
• Crushing round bits and square outer wall, broken slag dust can be discharged from the tube.
• Exquisite blade grinding process, edge is shar-per and more sturdy.
• Reduce labor intensity of construction workers and speed up the construction.
• Drilling square holes in wood with a mortising machine or a mortising attachment.
• Suitable for construction, installation, renovation, decoration industry, etc.

Specifications:

• Clamping cylindrical diameter: 19mm
• Type: 1/4"(6.4mm); 5/16"(8.0mm); 3/8"(9.5mm); 7/16''(11mm); 1/2"(12.7mm); 9/16"(14.2mm); 5/8"(16mm); 6mm; 8.0mm; 10mm; 12.7mm; 15mm; 18mm; 20mm;22mm;25mm;30mm(optional)
• Package size: 230 * 35 * 35mm
• Package weight: 120-450g