1、High Hardness: This universal wrench adopts premium steel material, which ensures 60HRC high hardness and resistant to impact and wear. 2、Self Tightening: This multifunctional wrench features self tightening and double ended design that ensure stable and convenient operation. 3、8 to 22mm: This multifunctional wrench meets your different needs, one end ranges from 8 to 13mm, and the other end is 14 to 22mm. 4、Wide Application: This double end wrench is widely used in construction, carpentry, automobile, bike, motocycle repair, and household maintenance. 5、Specially Designed Teeth: This self tightening wrench is specially designed with safe teeth, effectively protecting screw threads. Small in size and light in weight, only 9.1in long, easy to store and carry. 4 x Self Tightening Wrench Item Type: Self Tightening WrenchMaterial: SteelPurpose: Wrench for Nuts of Different SizesTarget People: Outdoor Enthusiasts, Car Maintenance Personnel, Family UsersProduct Length: Approx. 230mm / 9.1in ( Manual Measurement, Slight Error May Exist )