Limit switch is very useful for limit detection. They are being used in many production lines, robotics, CNC drill machine and IoT projects. This is heavy duty and high quality limit switch with roller arm. Rated to handle 250VAC and 115VDC, it is very useful even for small electronic project too.

Anyway this is a limit switch with Roller Arm.

• ME-8108 Adjustable Roller Arm Limit Switch is a wide choice of heads and actuators.
• Captive cover screws.
• Internal grounding screws.
• Temperature range +5° F to +160° F (-15° C to +70° C).
• Lever Arm can be rotated to the left by 90 and to the right by 90.
• Variety of operating characteristics such as dustproof, oil tight, water resistant.
• Mode of operation is field adjustable. 
• Deal electrical control switches in Mechanical and other industries. 

Specifications:

• Product Name: Adjustable Roller Arm Limit Switch
• Model No.: ME-8108
• Actuator Action: Momentary
• Actuator Type: Rotary Adjustable Lever Arm with Roller
• Contact Configuration: 1NO,1NC(DPST)
• Rated Voltage: AC 250V 5A, DC 115V 0.4A
• Roller Dimension: 1.8 x 0.7cm / 0.7 x 0.25" (D*T)
• Lever Arm Length: 10.5cm / 4.1"
• Fixing Thread Diameter: 0.4cm / 0.16"
• Total Size(Approx.): 12.5 x 2.8 x 5cm / 4.9" x 1.1" x 2" (L*W*H)
• Mounting Size: 56 x 21mm/ 2.2" x 0.8" (L*W)
• Material: Rubber, Plastic & Metal
• Main Color: Silver Tone, Blue, Black
• Net Weight: 92g