The Max 2025 motor feature Slotless design for high efficiency and High performance. Direct replacement for Speed 370/400/480 type can motors. For light electric planes under 30oz(840gr) or 3-D performance under 18oz(504gr) For most gear drive applications - use HA2025-3200, Motor specs: Diameter 20mm, Length: 45mm, Weight: 66gr Shaft: 2mm MaxCurrent: 15A, Power: 175W KV: 3200 Please use ACC3966OFFSET GEARBOX FOR 20mmBRUSSLESS MOTOR STICK MOUNT