No hammer, vise, or other tool needed. Insert hose with ferrule and splicer or nut and nipple in proper hole. Offset tool approximately 1/8" from end of ferrule and squeeze. Make 1/4 turn and squeeze again.
Unit of Measure
Items
Ferrule Crimping Tools, Vice Grip Type KT-28

2-Hole Jaw Crimper

Ferrule Crimping Tools, Vice Grip Type KT-30

3-Hole Jaw Crimper
Use with N/A 3/16 to 1/4 Hose I.D. N/A 11/32 Hose I.D. 27/64 Hose I.D. 5/16" Hose I.D. 7/16 Single Hose I.D. 7/16 Twin Hose I.D. 9/16 Single Hose I.D. 9/16 Twin Hose I.D.
Part N/A Crimping Tool