1560M Protector Mobility CaseInterior: 506 380 229 mm Exterior: 604 466 307 mm 4" diameter x 1. 5" wide (10. 2 x 3. 8cm) heavy duty polyurethane wheels with stainless steel bearings Water resistant, crushproof, and dust resistant Open cell core with solid wall design strong, light weight Retractable extension trolley handle Easy open double throw latches Stainless steel hardware and padlock protectors Automatic pressure equalization valve balances interior pressure, keeps water