Please note that this is not an interchangeable handle.
This diamond awl blade is made by the same manufacturer as System S+U needles with high-quality steel from Germany. The curved shape allows you to get into narrow/tight areas and to join two pieces of leather easily.
The stitching awl handles are made from African Blackwood and solid brass ferrule. 
If you do not need the handle, visit here for the awl blades only.