Daicamping DL15 Mini Portable Multifunctional EDC Multitools Outdoor Camping Survival Taptical Hunting Multi Tools Folding Handle:2Cr13 Hardness: HRC46-48, :7Cr17, hardness:HRC55-58; Tooth cutting :3Cr13, Hardness :HRC52-54; File:3Cr13 hardness: HRC52-54; Saw:3Cr13, hardneses:HRC52-54; Scissors:3Cr13 Hardness:HRC52-54; Opener:3Cr13 Hardness:HRC52-54; Needle:3Cr13 hardness:HRC50-53; screwdriver bit:3Cr13 Hardness:HRC50-53; Bit:33mm ModelSP8+SP4/TT25+TT20/TT15+TT10/SL6+SL5/SL4+SL3/H5+H4/H3+H2.5 Saw parts:58CR4, Use environment: 1.if you use it in a wet or High Salinity and alkalinity environment, a.wash it by pure water b.wipe it by cloth c.add oil on it 2.if there have stickiness things for some time,you have to clear it by water or detergent at once 3.Clear the tools Oil residue and so on ,,Kindly Use turpentine or mineral oil,forbid to use detergent with chlorine. 4.After cleaning,wipe your tools,add some light oilsuch as WD-40 ,so that we can clear the wet and moisture off from Joint. then the tool will not corrupted.. How to sharpen a . 1.STRAIGHT ,USe standard device to sharpen itgrindstone, grindstone and so on . 2.serrated ,you have to use special tools for it,sharpen it by right ways ,can keep serration curvature.Important!!, Just sharpen the front teeth,,don't the back size ,will lead to reduce the Function!!!!