I'm designing a coffee table using oak wood and a granite top, 12 sq ft. It will weigh about 75 to 80 lbs total. I need 4 wheels/casters, 2 with locks and 2 without and with a modern Euro or American design. I do not want the standard office or furniture type casters. They need to have about a 3 inch diameter, threaded. Black & gray or black & chrome preferred. Thank you for your help and advice. Allen.