Perko Spring Clamps 1" - 1-3/4" - Pair. They are an economical way to hold and store boat hooks and other poles. The spring clamps are constructed with stainless steel material. Specifications include: 2-1/4" projection 1" minimum inner dimension 1-3/4" maximum inner dimension and 5/8" clamp width. Number 6 screws are required for installation. Specifications for Perko Spring Clamps 1": Manufacturer: Perko Color: Black Quantity: 2 Features of Perko Spring Clamps 1" Stainless Steel Minimum I.D.: 1" Max I.D.: 1-3/4" Projection: 2-1/4" Width Clamp: 5/8" Package Contents: Perko Spring Clamps 1" Perko 0502DP2STS: Spring Clamps 1" - 1-3/4" - Pair