
【Solid:】 HSS (High Speed Steel) M35 refractory, wear-resistant, high toughness, high hardness up to 63 - 65 HRC. 【Sharp:】 Cutting blades through professional heat treatment and hot cutting, fine grinding forming perfect for quickly cutting thin materials with precision. Suitable for stainless steel, thin copper or aluminum plate, plastic sheet etc. 【Low impact:】 The spring design provides a buffer effect in the process of high-speed drilling to prevent too much pressure. Very suitable for use on handheld electric drill, bench drill, drill press etc. 【Attention:】 The cut object must be well fixed, and the drill bit must be placed perpendicular to its plane. Tip: Add coolant to the edge of the hole to avoid overheating and wear the goggles which can protect your eyes. 【Tallie:】 For 16mm/0.62'', 18mm/0.71'', 20mm/0.78'', 25mm/0.98'', 30mm/1.18'' holes Complete Equipment 5PCS Hole Saws, 16mm/0.62", 18.5mm/0.72", 20mm/0.78", 25mm/0.98", 30mm/1.18". High Precision: The idea of spring in the