The WXC305 screws kit can be used to mount the heatsinking accessories to the following temperature controllers and laser diode drivers from Wavelength Electronics: LDTC0520, LDTC1020, WTCP5V5A, WTC3243, WTC3243HB, WHY5640, LDTC 2/2 O, LDTC 2/2 E, WLD3343, WLD3343-2L, WLD3343-3A, WLD3343-3L or WLD3343HB . The controllers operate to 500 mA without any additional heatsinking (assuming 5 V operation). To operate up to 1 A, add the thermal washer WTW002, and WHS302 heatsink. To operate to the full 2.2 A, add a fan WXC303 (5 V) or WXC304 (12 V).The WXC305 includes (2) 4-40 x 0.75" and (2) 4-40 x 1.0" screws. Following Kits from Wavelength Electronics include the WXC305 screw kit: WEV300, WEV301, or WEV302.