Spring Sales Event CUSTOMIZE YOUR SPRING Shop Now KYDEX SHEATH KITS Shop Now 1 2 Customize Your Spring with Armory Plastic Sheath Kits.Customize this sheath to your own knife. Fit your sheath to your desired click. Customize to be a left or right handed sheath! CUSTOMIZE TO YOUR KNIFE STYLE 1 Available in Different Shapes, Sizes and Colors Rounded Sheath Kits Accommodates blades 3"-4", 4"-5, and 5"-6". DIY Sheath Kit Original Rectangular This is a versatile DIY knife sheath that can be used for up to a 5″ blade with only 1″ of the handle placed in the sheath.