Use For: These extractors will remove most types of damaged, rusted, broken or stuck screws from any wood or metal surface. Premium Material: They are made from premium steel with heat treatment for extra hardness and long life.Suitable for different sizes: 6 heavy duty screw extractors in different sizes to meet multiple needs. 6 pieces of high hardness drill bits work well for drilling Widely applicable: the drill bits can also be used to drill holes on wood, metal, plastic, brick and wall, etc. Practical tool: easily remove screws, bolts, studs, threaded pipe fittings, etc. damaged or broken.Specifications: Condition: 100% New Material: Steel Color: As Picture Shown. Suitable for removing broken screws Size: 4-6 mm (1/8 -1/4'), 6-8 mm (1/4 -5/16'), 8-11 mm (5/16 -7/16 '), 11-14 mm (7/16 -9/16'), 14-18 mm (9/16 -3/4'), 18-25 mm (3/4 -1') Square head size length of screw extractors: 3.2 mm, 3.7 mm, 5.3 mm, 6.6 2 mm, 8.3 mm, 12 mm Length of screw extractors: 9 cm / 3.54 inch, 8.3 cm /3.27in, 7.4cm/2.91in, 6.5cm/2.56in, 5.7cm/2.24in, 5cm/1.97in Drill Size: 3/32 in, 1/8 in, 3/16 in, 1/4 in, 5/16 in, 3/8 in Drill Length: 12.5cm/4.92in, 11cm/4.33in, 9, 3& nbsp; cm/3.66in, 7.5cm/2.95in, 5.5cm/2.17in, 4.8cm/1.89in Weight: approx. 392g Package included: 6*screw extractors 6*drill bits