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The Zipbolt UT Micro Railbolt was developed for use in low profile or small handrails and is perfect for joining handrails to balusters, spindles, or newels. This model retains all the features of Zipbolt's UT Railbolt but in a reduced size. Both diameter and thickness/profile are reduced, which allows for a joint to be made with a smaller entry hole. The Micro Railbolt shaft has a hex shape midway and using the optional deep socket drill bit (See 40.500 6mm Deep Socket Tool) makes the whole joint assembly quick and easy. This pack includes a 4mm hex bit with quick release shank.