Diamond Riff Segment Saw Blade ACZ 85 RD4. The Starlock ACZ 85 RD4 segment saw blade offers guaranteed high durability when removing mortar and abrasive materials. The cutting edge is fitted with high-quality diamond riff of grain size 40 for exceptional wear resistance. This blade is ideally suited for routing tile joints and cutting smaller openings in soft wall tiles. It can also make precise cutouts in abrasive materials such as fiberglass and epoxy resin-reinforced plastics, cement board, and fiber-reinforced composites. It is compatible with all Starlock, Starlock Plus, and Starlock Max type power tools, as well as all common multifunction tools. The pointed ends of the blade allow for work in hard-to-reach corners, while the round part of the blade ensures straight cuts. The Starlock attachment system enables quick blade changes without touching the blade in three seconds. The attachment system ensures maximum power transfer between the machine and accessory through its three-dimensional tight fit.