This is the most common question asked by most of TOPS Knives users, and the angle to sharpen any TOPS Knives is 25 Degrees. Because each knife at TOPS manufacturing facility is handed grinded and their grinders are set at 25 degrees. Given their Scandi Knives like ( Scandi Trekker, BOB or MSK etc)  have slightly convex edge, which leaves the blades to be little more thinner resulting edge little less than 25 degrees.