Hello, The knobs we require are very high heat resistant and must not discolour. they are 70mm in diameter and the hole in the back for the gas valve must be 8mm to fasten with a small screw, or be spring loaded. I include a photo it does not have to be the same style but must be the same measurements and in red. We order 100 at a time from Italy and our budget price is 1.5000 Eu. Regards. 联系方式Co:Catervent Systems CC Add:South Africa Tel:27-11-6839033 Fax:27-11-683-1673 Email:rusty@catervent.co.za联系人：usty国家：South Africa产品类别机械五金rusty@catervent.co.za
