Protech Brend 3 auto Knives. Automatic knives designed by Walter Brend for Protech Knives. The Pro-Tech Knives Brend 3 auto (medium) mid size piece is the perfect companion to Protech's Brend #1 (Large) and Brend #2 (Small) Auto knife series. Available in many variations, this super slender, lightweight and awesome 3.75" Brend design has super cutting power and is fitted with a stainless pocket clip for tip up carry. It's overall open length is 9" and comes with a 2.9" long .110" thick 59RC Blade and the Handle is 6061-T6 Aluminum, 5" Long, 1.15" Wide and 0.45" Thick. This knife's average weight is 4 ounces. This automatic knife has INCREDIBLE Coil Spring Action so HOLD ON TIGHT!