Features 【Premiun Material】This motor shaft collet is made of high quality steel material, straight shank with clamping nut to be tightened. 【Safe to Use】Extension rod diameter and the other parts are precision ground to eliminate unbalance, increase safety when cutting. 【Ergonomic Design】Straight extended shank fits for deep processing, meeting the needs of extending the depth of processing. 【Easy to Storage】Collet is well packed in a protective container with label for safe transportation and storage. 【Widely Used】It is widely used in boring, milling, drilling, tapping, grinding and other processing. Features: 【Premiun Material】This motor shaft collet is made of high quality steel material, straight shank with clamping nut to be tightened. 【Safe to Use】Extension rod diameter and the other parts are precision ground to eliminate unbalance, increase safety when cutting. 【Ergonomic Design】Straight extended shank fits for deep processing, meeting the needs of extending the depth of processing. 【Easy to Storage】Collet is well packed in a protective container with label for safe transportation and storage. 【Widely Used】It is widely used in boring, milling, drilling, tapping, grinding and other processing. Specifications: Type: ER11A-8mm Material: Steel Height: 40mm / 1.57" Shaft Diameter: 16mm / 0.63" Shaft Inner Diameter: 8mm(±0.02mm) / 0.31" Nut Diameter: 19mm / 7.48" Nut Inner Diameter: 9mm / 3.54" Package Includes: 1 x Collet Note: Please allow 1-2mm error due to manual measurement. Thanks for your understanding. Package List