Solid Brass Belt Loop Keeper Squared The Solid Brass Belt Loop Keeper Squared is ideal for holding down the end of your strap once it's gone through the buckle. Perfect for use on belts, dog collars and leads, and bag or backpack straps. These are available in the following sizes: 25 mm - The internal width is designed to fit the width of a 25 mm strap. It has an external width of 31 mm and internal depth of 9 mm. 32 mm (1.25 inch) - The internal width is designed to fit the width of a 32 mm strap. It has an external width of 38 mm and internal depth of 11 mm. 38 mm - The internal width is designed to fit the width of a 38 mm strap. It has an external width of 46 mm and internal depth of 11 mm. 45 mm - The internal width is designed to fit the width of a 40 mm strap. It has an external width of 46 mm and internal depth of 11 mm. Our belt keepers are available in either brass or silver (nickel plated) finishes. Recommended for use with leather belt and strap cutter tool.