Sure Grip handles can have the momentary button switches replaced with an on/off toggle or push on/push off switches in any of the faceplate locations. Some of the optional switches are shown on the accessories parts page.

Standard Switch SW-00
Electrical Rating: Standard 5A at 30 VDC
Mechanical Life: Standard 10 million cycles
Electrical Life: (see chart)
Sealed Switch SW-00S
Electrical Rating: Sealed 3A at 30VDC
Mechanical Life: Sealed 5 million cycles
Electrical Life: (see chart)
Enclosure Rating: Sealed IP67 (IEC 529)
Temperature Range: - 40 to +85 Degrees C
Ambient Humidity: 95% max.
Sealed Switch Gold Contacts SW-00SG
Electrical Rating: Gold 100mA at 30 VDC

Refer to the manufacturer websites below for additional information:
Omron Switches:
http://www.omron.com/ecb/products/sw/
Salecom Switches:
http://www.salecom.com/toggles-switchs.html
NKK Switches:
http://www.nkkswitches.com