the big pin vise hand drill is made of quality aluminum alloy, compact and hard wearing; The PCB mini drills adopt reliable , and the micro twist drills are made of alloy steel, hardly rusting or deforming, can be applied repeatedly, serving you for a long time measuring . 3.5 inch/ 89 mm in length, the pen drilling vise adopts a 3 claws chuck, equipped with an adjustable clamp, can be adjusted from 0.01 inches to 0.13 inches, comfortable to grip; The PCB drill bits are . 0.13 inches/ 3.2 mm in diameter, with a total length of . 1.5 inches/ 38 mm you get 49 pieces of manual hand drills, including 1 piece of big pin vise, 48 pieces of small twist drill bits, available in various diameters and lengths, and 10 pieces of micro drill bits, a total of 59 pieces, adequate and various to satisfy your crafting needs in there are diverse functions for the mini twist drill bits, for example, they can help you a lot in carving, sculpting, drilling, doing well in handling wood, plastic, carbon fiber, composite board, cloth, rubber, bone, glass, stone and more, moreover, the rotary tool vises can process with these mini drills for jewelry, you can make your own crafts or jewelry, such as wooden home signs, wood figures, bracelets, necklaces, keychains, and so on, just make full use of your creativity and explore crafting fun, Manufacturer: Uxsjakjsd