Features Premium Aluminum Construction - Crafted from durable aluminum alloy, this Miter Track Jig ensures longevity and reliability for all your woodworking projects Versatile T Slot Compatibility - Designed to fit T screws and quick-acting clamps, this fixture provides seamless integration for efficient and precise setups Four Size Options Available - Choose from 100mm, 200mm, 300mm, or 450mm lengths to match your specific woodworking needs and enhance your project versatility Precision Engineering for Accuracy - The innovative design of this Miter Track Fixture guarantees accurate cuts and reliable performance for Features: 1、 YG8 alloy cutter head with good wear resistance. 2、Complete specifications from 2.8-4mm drilling diameter. 3、 spray treatment, and oxidation resistance. 4、For wood, aluminum alloy countersinking, opening. 5、Each drill bit is in their own case for protection. Specification: Item Type:Countersink Drill Bit Material:YG8 Alloy 45# Carbon Steel Type:2.8x8mm 3x8mm 3.2x8mm 3.5x8mm 4x8mm Net Weight: 160 g / 5.64 oz(approx.) Package List: 5 x Countersink Drill Bit 5 x Hex Socket Wrench 5 x Screw Package List 5 x Countersink Drill Bit 5 x Hex Socket Wrench 5 x Screw