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Its a self- cleaning stub on the collar nut, when rotated.Automatically cleans the threads of dirt, cement and other foreign substances that hamper quick and easy adjustment.Simple insertion of a rod in the holed boss on the collar nut facilitates turning of the collar nut in confined spaces.
We are a large-scale joint-stock enterprise integrating scientific research, production and sales.Our leading products have crushing equipment, sand making equipment, mobile crusher, etc., Each type of product is with complete specifications. All products have passed ISO9001, CE and GOST international quality system certification.