2079270 14mm (0.6") Speed Slot Bi-Metal Hole Saw. LENOX T3 Bi-Metal Hole Saws feature 50% longer life than the previous generation of LENOX hole saws. Increased wall thickness improves durability and minimises tooth loss while the LENOX SPEED SLOT staircase design allows for fast, east plug ejection. Features: Improved Metal Cutting Performance - Increased wall thickness improves durability and minimises tooth loss. Optimised tooth design penetrates metal with ease. Fast, Efficient Cutting in Wood - Larger, sharper teeth remove more wood for fast cutting. Easy Plug Removal Speed Slot - staircase design for fast, easy plug ejection. Specifications. Blade Material: Bi-Metal. Size: 14 mm / 0.6''. 9/16.