Ibiranga: Urudodo rwa trapezoidal nuburyo nyamukuru bwo kohereza bwa screwdrive, ikoreshwa cyane cyane kubikoresho nyamukuru biganisha ku bikoresho byimashini hamwe na disikuru ya screw ya disiki ifite ibikoresho.
Inyungu :
Urudodo rwa Trapezoidal rwitwa kandi Aike umugozi wumugore.Urudodo ni ruto, ariko rushobora guhindurwa nimbuto nyuma yo kwambara.Inguni ya metero ni dogere 30, naho inguni ya santimetero ni dogere 29.Mubisanzwe bikoreshwa kumurongo wambere wa lathe.Ikimenyetso ni "TR".