VERSATILE 5-PIECE SET: This Trend Snappy TCT Countersink Set includes 5 essential drill countersinks, covering Imperial screw gauges from No.4 through to No.12. TCT CUTTING TIPS: Designed with TCT (Tungsten Carbide Tip) cutting tips, these countersinks offer long-lasting performance in a wide range of materials, including ply, MDF, and chipboard. ADJUSTABLE DEPTH: Adjustable drilling depth feature allows you to customize the countersink depth to suit the material thickness, ensuring clean and precise results. QUICK RELEASE SYSTEM: Compatible with the STC (Snappy Tool Changer) quick release system for hassle-free tool changes. Can use with Trend Snappy SNAP/PC/95T or SNAP/PC/38 Plug Cutters for hidden fixings. IMPERIAL SCREW GAUGES: Each drill countersink in the set is specifically designed for a different screw gauge: 2.0mm (5/64"), 2.5mm (3/32"), 2.75mm (7/64"), 3.25mm (1/8"), and 3.5mm (9/64"). The set also includes 9.5mm and 12.7mm counterbore diameters for added versatility.