Overview Reviews Product Description ER40 Collet, 5/16" | YG-1 5/16" ER40 Collet High Quality Hardened & Ground Spring Steel Manufactured by YG-1 Product Videos Size Size 5/16 in. Type ER40 Product Reviews Write a Review Write a Review × YG-1 ER40 Collet, 5/16" | YG-1 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *