Aids in the setting of center lines, establishing angles and marks for butt-ins, location points inside pipes and tanks, laying out key ways, and measuring declivity. ,Used on pipe 1/2 diameter and larger. fitted with an adjustable dial set level (DSL) and a manually operated hardened centering pin ,4 inch Y-type head ,Fitted with an adjustable dial bubble protractor (DSL) ,Use this manually operated Jackson Safety hardened centering pin with a small hammer or mallet to tap the pin in for effective pipe marking