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The BEST for hobbyists, semi-professional model RIEDEL TECHNIC. Strap shortening machine made of metal with a plastic block, 6 punches (0.4, 0.6, 0.7, 1.0, 1.5 and 2mm), a screwdriver insert with 4 screwdriver blades (0.6, 1.0, 1.8 and 2.5mm), very easy to use. 2 variants in one device. 1: unscrewing strap screws. 2: removing strap pins. I also recommend you supplement this tool with a watchmaker's hammer.