The APT Model 109 and Model 115 are lightweight tools for drilling holes for anchor bolts and small dowel hole drilling. These versatile tools have a stop rotation feature that converts them from a rotating hammer to a non rotating hammer for light chipping and overhead work. The Model 137 and Model 155 are used for general construction, utility work and plant maintenance. They are designed for drilling through granite, hard faced rock, quarry drilling and drilling secondary holes for blasting. These larger tools can be also utilised with dowel hole drilling machinery. The Model 137 and 155 are also available in wet drill models when dust suppression is required.