Flat washer DIN 125, GOST 11371-68 Used for construction connections. Used together with bolts, screws, etc..
Twist drills DIN 338 (steel HSS) Made of high-speed steel HSS. This corresponds to the screw group drills with tapered sharpening. Used for drilling holes in metal.
SDS hummer drills, masonry drills Used for drilling holes in concrete, brick, stone, ceramics, marble.
