Central Door Knobs

Excuse me for being dramatic, but a genius like Jasper is a rare thing. And, like all geniuses, he is constantly coming up with new ideas. One day, as he lay in his student bedroom, he was staring idly at the light bulb hanging from the ceiling, and there it was, a perfect design, born of a mundane observation.This knob exists in various technical versions and can be used even with restrictions, such as on a glass door or instead of turning knobs. Ask us all of your questions on the subject; we know the answers!