Thumb Score: +28 Home Depot.com has 2-Piece Anvil 18-mm and 9-mm Snap-Off Knife Set for $1.47. Select in-store pickup where available to save on shipping. Thanks honestmirror Note, availability for in-store pickup may vary depending on location. Deal Editor's Notes & Price Research: The ANVIL 2-piece snap off knife set features an 18 mm Snap knife and a 9 mm snap knife.The plastic housing is durable and is designed to resist the elements.