The 4 inch flap wheel is a versatile tool since its trimming power is not compromised even when maneuverability is required. Because of its smaller diameter, access to tighter spaces is possible. In the automotive industry, professional mechanics use 4 inch flap wheels for polishing and sanding small parts and body panels of engines. Due to the detail and level of precision required for grinding and finishing, 4 inch flap wheels are also popular in jewelry making as well as small scale metalworking. Even with the 4 inch flap wheel, effective material removal and surface finishing can be achieved when paired with the applicable abrasive materials.