I have a number of after market razor handles and have found a couple which have sharper coarse knurling and thus a better grip than any factory handles I know of. The first is the ixgrip from Germany which is commonly available on ebay, though not at the moment. Very grippy due to coarse and sharp knurling. The second it the new Stirling Soap Dallas handle which has a combination of pentagonal shape areas and 16+mm round sections. The round areas are very sharply knurled so provide an excellent grip. Also a very attractive handle design in my opinion and it claims to be 316 stainless, one of the most corrosion resistant steels. The Stirling handle is the upper photo and the ixgrip is the lower one. Both are close to 90mm length. What is your preferred grippy handle? I like a grippy handle as I am a shower shaver.