Milling Drill Bit Set 6 Piece Drill Bit Set Wood Milling Drill Bit with Depth Stop Drill Accuracy ± 0.02 mm for Woodworking in HSS-M2 with 1/4 Inch Hex Shank

Size: set of 6 carbide countersink drill bits, consisting of an HSS-M2 drill with countersink (including 4 drills: 2.8 × 8 mm / 3.2 × 8 mm / 3.5 × 10 mm / 4 × 10 mm + hex key), 82° countersink angle compatible with standard 3/8 inch screws, 1/4 inch hex shank for electric drill interface, for solid wood treatment wood drill bit set Material: Carbide depth stop drill bit, equipped with double positioning bearing and silicone O-ring buffer. The mechanical self-locking mechanism triggers immediately upon contact with the piece (movement tolerance ± 0.05 mm) and the stop ring is forced into position to prevent any excessive drilling. Adjustable depth: the adjustable depth drill bit is equipped with a graduated ring (including a non-slip tooth pattern for one-handed use), a front guide blade + a mirror-polished lateral blade with a roughness of Ra ≤ 3.2 μm and a reverse spiral wood-specific depth lock, which allows for zero indentation of the substrate thanks to a double-contact buffer layer. Efficient Chip Removal Design: 30° spiral blade groove chip removal design effectively increases chip removal rate by 70%, reducing wood fiber adhesion, prolonging drill bit life, and effectively preventing dust residue accumulation, thus avoiding clogging. Widely used: Set of coated wood drill bits (applicable materials: solid wood/OSB/MDF/multilayer plywood), mandatory use of reverse cutting mode specified at 200 RPM, strictly prohibited for metal, plastic or thin panels with thickness < 3 mm