A20-34S Outunner brushless motor Shaft size: 3.175mm *14mm Dimensions: 28mm *22mm A20-28M Outunner brushless motor Shaft size: 3.175mm *14mm Dimensions: 28mm *28mm A20-20L Outunner brushless motor Shaft size: 3.175mm * 14mm Dimensions: 28mm * 32mm The dimension of the burshless motors which we can supply is from 26*23, 26*27, 26*32, 27*30, 28*25, 28*30, 28*36, 31*25, 36*32, 36*39, 36*48, 45*40, 45*50, 45*58, 63*45, 63*64...And we can custom for you.