ProTech Brend 1 Auto Knife. The LARGE one. ProTech Brend Auto knife Large is made with 154-CM Stainless steel and comes with a 4.625" long blade .125" thick 59RC with a T6-6061 Anodized Aluminum Handle, .48" thick, 1.30" wide, closed length 6", open overall length 10.625" and weighs in at an average of 5.7 ounces. The Protech Brend "Model 1" automatic knife is the largest of the 3 Walter Brend famous Brend designs with this blade shape produced for Protech Knives. All Protech Knives come with a limited lifetime warranty. Made in the USA.