Lockback Knife on a Key Chain by Bartech Pro This handy little mini knife on a key chain features an extra sharp 1-7/8î 420 surgical stainless steel half-serrated blade to cut cord or twine easier and lightweight Leymar handle. The thumb stud allows one-handed opening with either the left or right hand. Measures 4-1/4" long opened and 2-1/2" closed. Lifetime warranty. Bulk Packed.