104a (5005001000mm),105a (540540150mm),105b (540640200mm) The KTJ series of external bracket of Beishi air conditioner is suitable for outdoor units of 1, 1.5, 2 and 3. This series of products are made of stainless steel, with three thicknesses to choose from:1.6mm,1.8mm and 2mm. The screw size is 8x80mm.