Model Number: ATX to SFX conversion Bracket. Adapter: Desktop power supply M to ATX Bracket. Due to the many models of various chassis on the market, the design of the conversion frame is designed for the SKTC chassis. Most of the other brand models are also compatible (except for a small part of the chassis, such as Yingguang 303),Small number of models are not compatible. Can install 3 screws, Please measure well.and then buy. Screw hole size:Large hole diameter 5.00mm?Small hole diameter 2.50mm. Style: With Side Panel Window.