Slice® SPG10524 Utility Blades (Rounded Tip) are ideal for handheld applications, such as trimming flash off injection-molded plastic, or for use in third-party handles. Slice developed these blades before creating our own line of utility knives. We recommend that customers try Slice utility knives, but if you need a larger blade for hand-held applications, the SPG10524 is made with zirconium oxide, which is non-magnetic, chemically inert, safe up to 1600 degrees Celsius, and never rust.