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This project pretends to get a bionic hand with a low cost and good benefits. With a one high torque actuator by finger. You have to pierce the holes with an M3 or M2 drill and some of that pieces you will have to file. For this device you only will need: 4x union 4x phalanx gear 4x phalanx_1 4x worm gear 1x palm 1x wrist lead 1x upper lead 1x bottom lead 1x thumb 4 DC motors: Pololu micro metal gear motors 250:1 : https://www.pololu.com/product/1095 4 worm metal gears modified with a prisoner screw and 4mm shorter, can be cutted with a dremell machine: http://www.mootio-components.com/conjunto-sinfin-corona-modulo-1000-entradas-100-diametro-exterior-840mm_ref_017051.html#.WKrkZfk1-00 Or use the plastic ones! Arduino Nano: https://www.amazon.es/ATmega328P-Arduino-Compatible-versi%C3%B3n-mejorada/dp/B00Q6WTWGO/ref=sr_1_3?ie=UTF8&qid=1487594993&sr=8-3&keywords=arduino+nano 2 Pololu DRV8833 motor drivers: https://www.pololu.com/product/2130 Micro servo motor: Tower Pro mg90s: https://www.amazon.es/compatible-pi%C3%B1ones-metalicos-radiocontrol-robotica/dp/B01DZQT5UG/ref=sr_1_2?ie=UTF8&qid=1487594852&sr=8-2&keywords=servo+mg90s Myo ware muscle sensor or other sensor to control it.