*Please allow 1 week to ship* One Belt Hog Pulley Alignment Tool comes with two laser transmitters, each equipped with two spring loaded tips which fit into the pulley grooves . One Belt Hog Pulley Alignment Tool also comes with various sized removable tips to fit standard sheave sizes A-E (0.2"-1.6"). Upon making contact with the pulley, two strong industrial magnets on each transmitter hold the Belt Hog in place. A laser beam from each transmitter shines onto a graduated target label on the opposite unit. Horizontal and Vertical corrections can then be visually determined simply by checking the placement of the beam on the target labels. A detailed instructional manual accompanies each Belt Hog which guides the user to an accurate, complete alignment! Dimensions: 2.40 x 3.00 x 2.35 in (h x w x d) Weight: approximately 1.4 lbs Battery type: (2) AAA batteries Operating time: 20 hours continuous operation Measuring distance: 6" to 20 feet Measuring accuracy: 3.49 mils/in (Better than 0.5mm or 0.2 degrees) Pulley diameter range: 3" and larger Pulley belt groove with: ALL known industrial groove profiles Classification: Class 2 laser Output power: