ddle screw for grounding to ensure safe operation.● The custom mounting kit makes it very easy to mount them in any kettle. You only need a 47mm hole punch and a large wrench (54mm).You maybe interested in the following productApplication: CertificationsDelivery&Package1. Lead time: 7-15 days after payment2. Delivery Term: DDU, FOB,CIF3. Shipping Mode:Air, Sea, Express4. Package: Carton box/wooden case