We are offering spiral nail stop collar. Crimson spiral nail stop collar uses two spiral locking pins which when driven in firmly lock the collar into position around the casing. this stop collar can be used in both upset and non-upset casing provides maximum annular clearance. They can be latched on to the casing pipe without having to be slipped on at the end of the casing pipe, thus allowing quick and easy installation. These stop collar undergo a special process of rust prevention before painting . The spiral nail stop collar are available in sizes 4 12" to 20"