Hi - Happy New Year 2013 - if you want more information on billhooks, please visit my website billhooks.co.uk - there you will find links to manufacturers, images and explanations. The billhook is good for green wood up to 2" even 3" diameter, depending upon type and hardness... Blades can be convex, straight or concave - length 7" to 12" (common sizes are 8" to 10") - available new and second hand on eBay - some excellent value tools on ebay.it for under 20 euros (about 30$) - Angelo, Rinaldi and Leonelli offer an excellent range of models... The machete was designed for jungle use - soft fast growing lianas, vines and grasses etc - the billhook is better for woody stems.