General description This set includes 6 square hole drill bits made of high-speed steel, designed for woodworking applications. The bits feature a heat-treated cutting edge for high hardness and efficient cutting. The innovative design of the drill guide minimizes tearing at the start of drilling, ensuring a smooth operation without offset or blockage. Technical specifications Material: High-speed steel Quantity: 6 pieces Sizes: 6.4mm, 8mm, 9.5mm, 12.7mm, 14mm, 16mm Compatibility and accessories Compatible with mortising machines or mortising attachments Not suitable for electric drills or bench drills Usage Ideal for drilling square holes in wood, including MDF, plastic, particle board, channel wood, pine wood, and basswood Not suitable for processing metal, glass, concrete, or gypsum board Other information Each drill bit is packed in a single plastic case for easy maintenance