AUTHENTIC PRAKTICA PB BAYONET BELLOWS SET with SLIDE / NEGATIVE COPIER UNIT with IT`S OWN BELLOWS  In working order  Really well made with smooth controls . I`m not sure how you connect the front of YOUR lens to the rear of the Slide Copier unit . You get EXACTLY what you see . Please note , these bellows are for the Praktica Bayonet Mount 35mm SLRs film SLRs , they do not fit anything else and that means they are NOT screw mount  . Free UK P&P .