Easi Plumb Oil Tank Security Lock - Stainless Steel | Ehotl Stainless Steel 1 x Padlock 1 x Drill Bit Easi Plumb Oil Tank Security Lock - Stainless Steel | EhotlA flat wood bit is supplied to enable the drilling of horizontal holes through the existing cap and the oil filling upstand collar. The Bar of the Security Lock is then passed through holes, the second hasp fitted and the padlock then used to secure the assembled lock