Key Features: Allows collection of harmful dust during surface grinding applications, Attaches directly to 125mm DEWALT grinders with keyless clamp, Sliding section allows access to corners and surfacing to edge, AIRLOCK compatible for quick, locking attachment to vac hose. Specifications: Hose Port OD & ID: 1.66? / 42mm & 1.37? / 35mm, Max Wheel Diameter: 125 mm, Weight: 0.3 kg.