The Whitecap Compression Handle is designed to reduce and eliminate noise and rattle from hatches while the boat is underway. The handle uses a compressed gasket to create a watertight seal for compartments or hatches. Outer Diameter: 3"Cutout: 2-1/2"Surface Depth: 1/8"-5/8"Fastener: IncludedHandle/Body: 316 stainless steelThread: 3/8"-16Style: Locking Made of 316 stainless steel Fastener included | Whitecap 3" Locking T-Style Compression Handle