A metal strip can be obtained during A Void Dance by using a Curious tool on a workbench, when you are in the Black Knight Workshop.
Metal strip - The RuneScape Wiki
Thieving - The RuneScape Wiki
Tripp Lite Power Strip Rackmount Metal 120V 5-15/20R 12 Outlet 15
Tripp Lite Power Strip Rackmount Metal 120V 5-20R 12 Outlet 15
Steel mattock - The RuneScape Wiki
Black Knight guard, RuneScape Wiki
Korasi, RuneScape Wiki
Category:Metals, RuneScape Wiki
Mining - The RuneScape Wiki
Steel claws - OSRS Wiki
Black Knight Workshop - The RuneScape Wiki