Thetasigma
Flashlight Enthusiast
Knurling increases surface area (and diameter too if it is deformation knurling), however the design of the knurling will impact how grippy the area is. Peak's knurling for example, is cut flat and polished which leaves the surface only slightly more grippy than smooth metal. The old Maratacs however had a nice sharp diamond knurl which distinctly increased the grip. Generally even a smooth knurl should have more grip than smooth metal with a firm grip since skin will deform to the surface, and have more contact due to the increased surface area.
