$14.91
Crown Bit
The original Topstar Fastening SystemTM replaces shimming and can make door hanging a one-person job. TOPSTAR™ is a dual screw which works as one and is perfect for door jambs/wooden windows, insulations, paneling and cabinets. Great for any fine adjustments in both directions.
Adjustable screw, with two moving parts in one. An inner screw and a sleeve as a screw head.
The sleeve is free spinning on top of the screw core.
The screw can only be installed with a special tool called Crown Bit, which locks both parts together.