The BJB 26.422.4109 is a high-quality, professional-grade G13 lampholder designed primarily for T8 linear fluorescent and LED retrofit lamps. This "end-mount" socket is a staple for DIY enthusiasts and electricians alike when repairing or building custom light fixtures. Its defining feature is a built-in leaf spring, which provides approximately 2 mm of length tolerance compensation—ensuring a secure electrical connection even if the lamp or fixture frame isn't perfectly sized. Crafted from durable polycarbonate with a PBT rotor, it is rated for up to 660W and 600V, making it robust enough for both residential garage lighting and industrial shop projects. The snap-in pin mounting system allows for quick, tool-free installation into thin metal luminaire walls, while the unshunted rotary locking mechanism provides a satisfying "click" to confirm the lamp is safely seated.