Description:Labor Saving: Self-locking function, labor saving when tightening.Tightening: Unique locking structure, rotating by hand, tightening the grinding disc more powerfully.Application: Suitable for for angle grinders from Ø 115mm to Ø 150 mm, for tool-free disc change. Thread Size: Required thread connection M14.Easy to Use: Allows for tool free disc change.Specification:Parts nut material: 40Cr, electroplated white zinc;Parts shell material: ST14, carburizing and quenching, 500-650HV1, electroplating white zinc;Part back cover material: 50#, heat treatment 40-45HRC, electroplating white zinc;Parts bracelet material: 65Mn, heat treatment 43-48HRC, blackened;Color: silverSize(approx): 50*13mm/1.97*0.51inch(dia*length)Thread connection: M14Package: 1 pc x Flange nutNote:1. Due to the light and screen difference, the item's color may be slightly different from the pictures.2. Please allow 1-2 cm differences due to manual measurement.