Features ✔【Premium Quality】The screw extractor is made of high-quality vanadium steel material, treated by heat treatment, with high hardness and wear resistance. ✔【Easy Operation】Reverse spiral design of the stud extractor set for maximum grip, so helps relieve your labor. ✔【Versatile Application】This screw extractor set contains 10 pcs different size extractors of 3.2-10.3mm, so can meet your repair work under different circumstances. ✔【Warm Tips】Recommended drill bit size (for location hole) of screw remover tool etched on each extractor, suitable for high torque applications. ✔【Quality guarantee and portability】This damaged screw extractor set is designed to remove broken studs and bolts. All screw extractors are subject to strict quality controls and we will help you solve problems at any time. Descriptions:This screw extractor set is designed to remove broken studs and bolts. Made of high quality vanadium steel material, and treated by heat treatment, with high hardness and wear resistance. And contains 10 pcs different size extractors of 3.2-10.3mm, so can meet your repair work under different circumstances.. Features:This screw extractor set is designed to remove broken studs and bolts.Made of high quality vanadium steel material,and treated by heat treatment,with high hardness and wear resistance.Reverse spiral design for maximum grip, so helps relieving your labor. Recommended drill bit size (for location hole) etched on each extractor,suitable for high torque applications.This product contains 10 pcs different size extractors of 3.2-10.3mm, so can meet your repair work under different circumstances. Specifications:Material: vanadium steel Color: grayQuantity: 10 pcsWeight: 537gSize: 1/8"(3.2mm), 5/32"(4mm), 3/16"(4.8mm), 7/32"(5.5mm),1/4"(6.3mm),          9/32"(7mm), 5/16"(8mm), 11/32"(8.7mm), 3/8"(9.5mm), 13/32"(10.3mm) Package Included:10 x Screw Extractor 1 x Red Case Package List