Kit of small parts and adaptors, 20.5 mm consisting of: 1 spacer block of 20.5 mm in raw extruded aluminium, 1 self-threading countersunk head screw Ø 4.8×30 in stainless steel 410, 8 spacers 20.5 mm in raw extruded aluminium, 2 connecting pins Ø 6.10×17.6 in stainless steel, 1 roller/lock connecting countersunk head screw M5x13 in stainless steel 410, 10 self-threading handle countersunk head screws Ø 4.2×56 in dacrotized stainless steel 410 and 6 self-threading countersunk head screws for roller fixing Ø 4.2×32 in dacrotized stainless steel 410.