272-581-36 Features: -Solid I-beam frame with magnetic edge.-Top read window.-Replaceable acrylic vials.-Beveled end plates protect from shock.-High visibility yellow.-Vial Material: Plastic.-Base Type: Magnetic.-Structure: I-Beam.-Brand Name: Magnetic Unitek.-Type: Builders Spirit Level.-Price is for 1 Each. Specifications: -Vial Positions: 1 45 , 1 Level, 1 Plumb.