xiluuyou HSS Titanium Coated Step Drill Bit 4-20mm, Straight Flute 1/4 Inch Hex Shank Multi Size Hole Cutter for Metal Wood Plastic PVC, Compatible with Cordless & Impact Driver

【Large Drilling Range 4-20mm】- Features 9 precise size gradients from 4mm to 20mm. Clear engraved markings allow quick size selection to finish large-diameter drilling and reaming tasks with just one tool. 【Anti-slip 1/4" Hex Shank】- Standard hex shank fits most cordless drills, electric screwdrivers and quick-change holders. Effectively prevents slipping during high-speed drilling for stable and safe operation. 【Straight Flute & Titanium Coating】- Straight flute design enables fast chip removal to avoid clogging and overheating. Titanium coating reduces friction, resists rust and wear to extend service life. 【Multi-material Application】- Suitable for thin steel, aluminium, copper, plastic, PVC pipes and softwood. Perfect for electrical installation, plumbing, vehicle modification and home renovation projects. 【Durable HSS High Speed Steel】- Made of premium HSS steel with heat treatment, featuring high hardness and good toughness. Produces burr-free smooth holes for repeated long-term use.