Lang Tools 1421 convertible retaining ring pliers provides safe and stable service of small retaining rings. These pliers allow for easy convertibility to and from internal and external use with the quick flip of a switch. An adjustable stop feature keeps rings open or closed for easy retaining ring installation and removal. The spring return handles allow for greater tool control and ease of use. Each pliers contain 5 pairs of alloy steel color coded tips and a hex wrench within a handy tip kit pouch. These patented pliers replace ten or more of any single competitor's limited-use pliers.