The TKBA 21 alignment tool has two components: a laser-emitting unit and a receiver unit. Each is attached quickly and easily - using a powerful magnet - to the inside or outside face of a belt pulley or chain sprocket. The TKBA 21 can be applied to most machines that use V belts, banded belts and ribbed belts - as well as those with chain sprockets. The case contents can be expanded with optional additional components such as belt tension gauges.