Walrus Oil Knife Oil as a 100% natural, food-contact safe conditioner that easily maintains, restores, and polishes kitchen knives, pocketknives, metal utensils, and wooden handles. The natural oil helps prevent rust, while the waxes help repel water which further contributes to rust. Knife Oil will also penetrate and condition wooden handles to prevent the wood from drying out and cracking. For best results, apply every 1-2 months or as needed. 4oz Bottle