The HTCHTSK is tapped with two 4-40 holes to match the HTC heatspreader. It is compatible with the HTC1500, HTC1500-62, HTC3000, HTC3000-62 and HTC4000-62 temperature controllers. Two 4-40 x 0.375″ screws are included. Free, effective, and responsive technical support is available to simplify integration of Wavelength products into your OEM design. Standard product can be easily modified to meet your application requirements.