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. Item Type: Self Tightening Wrench Material: Steel Purpose: Wrench for Nuts of Different Sizes Target People: Outdoor Enthusiasts, Car Maintenance Personnel, Family Users Product Length: Approx. 230mm / 9.1in ( Manual Measurement, Slight Error May Exist ) 4 x Self Tightening Wrench