1, Heavy duty aluminum I-Beam fram. Thickness: 2.2mm.
2, Three block vials instead of tubular vials accuracy: 0.5mm/m(0.0005in/in).
3, Powder coating finish or color anodized finish.
4, Top reading & amplified vial for easier watch.
5, Two big handles with rubber cover for comfortable work feeling
6, Rubberized end caps for strong shock resistance.
7, Two big hanging holes on end caps for convenient storage.
8, V-grooved bottom for round pipe work purpose