7.9 x .9mm x 5.5mm DC Male to 5.5 x 2.5mm DC Female Power Plug Tip for Lenovo Laptop Adapter, Power Adapter

Male Plug (Output): 7.9mm (Outer Diameter) x 5.5mm (Inner Diameter) with a 0.9mm center pin.
This is the standard "large round" tip for classic Lenovo ThinkPad and IBM models.
Female Jack (Input): 5.5mm x 2.5mm DC socket.
This is a universal size that accepts power from many third-party AC adapters, power banks, and universal charger tips.
Features Plug-and-Play
Design: Requires no additional setup; simply attach the tip to a compatible 5.5mm x 2.5mm male charger end to instantly convert it for Lenovo hardware.