The Bosch OSL350SPD Star lock Oscillating Multi-Tool Delta Sanding Pad is a triangular pad to attach triangle-shaped sheets designed for detailed sanding. This pad features the Star lock three-dimensional tool-accessory interface, which provides more contact area versus flat interface for best-in-class grip and highest torque transfer. Sanding with a multi-tool often requires access to hard-to-reach areas at difficult angles. Bosch sanding triangles also meet the need for material removal and surface finishing on multipurpose plywood, hardwoods and softwoods.