Replacement Chisel 4.0mm Tip for WLBRK12 Weller's Cordless Rechargeable Soldering Iron. The Chisel Tip is easy to replace without a tool and is perfect for your electronic soldering tasks. Solder on-the-go with Weller's Cordless Rechargeable Soldering Iron. 12W Lithium-Ion Battery enables you to use it while recharging for continuous operation. With its 45 second heat-up, full range of tips, LED light, auto shut off, and integrated safety rest, it's perfect for your soldering tasks.