Spade drill bit Irwin 10502807 — diameter 1.3 cm

Irwin 10502807 spade drill bit with a 1.3 cm diameter is a flat-blade bit designed for drilling clean, large-diameter holes in wood and similar soft materials. The bit features double cutting spurs that scribe the outer edge of the hole to reduce breakout and a thicker cutting edge intended to extend usable life. A BLUE‑GROOVE point and cutting edge improve chip evacuation and drilling speed, while a reinforced shank increases durability. The 1.3 cm cutting diameter and quick-change 1/4" shank make this spade bit suitable for hand-held drills and quick bit swaps.

Advantages

The double cutting spurs minimize tear-out on the exit side of the hole and help produce a more accurate perimeter. The thicker cutting edge resists wear during repeated use, contributing to longer service life compared with thinner flat bits. The BLUE‑GROOVE point and cutting geometry facilitate faster chip removal, reducing clogging and heat buildup. A 10% larger shank cross-section improves overall strength and the 1/4" quick-change shank allows fast installation in compatible chucks and adapters.

Suitable for

• Drilling large-diameter holes in softwoods and plywood
• Rough framing and structural carpentry where fast through-holes are needed
• Installing utility lines, running cables or conduit through wooden studs
• General-purpose woodworking tasks requiring a 13 mm (approx. 1.3 cm) bore

Key specifications

• Cutting diameter: 13 mm (1.3 cm)
• Bit type: spade / flat-blade
• Shank type: 1/4" quick-change
• Cutting features: double spurs, thicker cutting edge, BLUE‑GROOVE point
• Intended material: wood and similar soft materials

How to use

Secure the spade bit in a compatible 1/4" quick-change chuck or adapter, ensuring the bit is seated firmly. Mark the drilling location and, if needed, use a pilot guide or center punch to position the bit. Start drilling at low speed to allow the double spurs to score the hole perimeter, then increase speed as the point engages and chips begin to evacuate through the BLUE‑GROOVE channels. Apply steady, moderate pressure—avoid forcing the bit—to maintain a clean cut and prolong bit life. Withdraw periodically on deep holes to clear chips.

Usage recommendations

Use the spade bit primarily for wood and engineered wood products; avoid using it on metal, masonry, or ceramic. For the cleanest exit hole, clamp workpieces where possible or support the exit side with backing material. Inspect the cutting edge before use and replace the bit if the cutting surfaces are severely worn or damaged.