£21.99 – £61.99
Nevin Slate Blackout Lined Curtain
Slate
7 Working Days
Pencil Pleat Curtains
Ready Made
117cm x 137cm, 168cm x 229cm, 229cm x 229cm
Child Safe by Design
Pilot the hole first with a 3-4mm multipurpose drill bit.
Then swap to a titanium coated drill bit to cut through the steel.
To assist on a thick lintel try the following tricks:
1) Swap between a traditional drill bit and a bullet tip bit, this changes the cutting shape.
2) Use a cooling past on the drill bits to avoid overheating.
See the entire answer