M8x65 concave end setting screws in a 10-piece pack, with internal hex drive and cup-point design, from a 12.9 class alloy steel assortment kit. This set is specifically designed for door handle installations and includes M2/3/4/5/6 set screws to cover common hardware needs. Key benefits - High strength material for industrial use: made from 12.9 class alloy steel to deliver excellent durability and long service life under vibration and heavy use. - Secure concave end design: concave end increases contact area for a more stable seating and helps prevent loosening over time. - Reliable seating with hex drive: internal hex drive enables easy tool access and reduces stripping, providing a dependable installation. - Versatile compatibility for door hardware: optimized for door handles and included assorted sizes to fit a range of fittings. Specifications and features - Material: 12.9 class alloy steel - Screw type: concave end setting screws with internal hex drive - End design: concave (cup-point) to increase surface contact - Size and quantity: M8x65, 10 pieces - Accessories: assortment kit includes M2/3/4/5/6 set screws for door handles 2-3 practical use scenarios - Replacing door handle screws on residential or commercial doors to restore secure grip and reliability. - Hardware assembly for furniture or cabinetry where durable set screws are required to hold handles or knobs firmly. - Maintenance and repair of metal cabinets, enclosures, or equipment housings that experience vibration and require secure fastenings. Usage guidance - Select the appropriate size from the assortment to match the existing hardware threads. - Use the internal hex drive tool for installation to ensure proper seating and to minimize cam-out. - Apply appropriate torque within recommended limits to maintain the integrity of the concave end and the bolt threads. This description provides a clear, professional overview of the product while preserving the original brand, specifications, models, and functions.