Our Tsuka with Ito Wrap and Kashira kit is specifically made to go with our combat Katana blade. The total length is 10″ (25.4 cm) including kashira. The core of the tsuka is red oak which is covered in our black Kevlar weave which simulates ray skin quite well. The Ito wrap is available in Black, Royal Blue, Dark Brown, Red and Green. Our Tsuka has a 1/4″ X 1/2″ tang slot and our kashira is actually made to accept a recessed allen nut for M6 x 1.0 thread. We chose to use a threaded tang to make it easy to swap out parts if needed.