The AdirPro Pole Peg Adjusting Jig is used to adjust and calibrate pole vials. Made of steel for long-lasting durability, it features an ‘L-bracket’ to rest the prism pole point on. It has an adjustable top piece that is used to center the pole before adjusting the bubble level. User-friendly and compact, it can be easily stored in a drawer, cabinet, or carrying case. The AdirPro Pole Peg Adjusting Jig weighs only 1.00 lb and measures 2.76” H x 3.15 W” x 3.54” D.