Telescopic tube for Dyson V11, extension tube compatible with Dyson V7 V8 V10 V11 V15, quick-connect suction tube with two 2-in-1 brushes (purple)

General Description: Professional design ideal for drilling square holes in wood with a mortiser. This set of chisels is perfect for the building, renovation, and decoration sectors, reducing labor intensity while speeding up work and reducing costs. Technical Specifications: Material: High-speed steel; Heat treatment: HRC 48~50, high hardness; Elongated center, high concentricity; Chisel sizes: 1/4" (6.35 mm), 5/16" (7.94 mm), 3/8" (9.5 mm), 1/2" (12.7 mm); Compatibility and Accessories: Fits all drill machines and attachments; Recommended use with drill, hammer, or other tools (not included); Application: The square hole drill bit is primarily used in woodworking to create precise perforations.