KwikStairs Left-handed Bottom winder staircase, (W)900mm. Kwikstairs is a revolutionary wooden stair kit solution. Supplied flat pack, Kwikstairs can be easily installed within a short amount of time. Kwikstairs has been designed to suit any staircase arrangement, be that straight flight, single winder, double winder etc.. Kwikstairs is a flat packed staircase ready to construct & install. The revolutionary stair kit is the easy way to make domestic stairs. Left-hand winder staircase pack by KwikStairs.