Ryobi Circular Saw PCL500 Tool Used / Missing Screw/Wingnut

5-1/2" Circular Saw - PCL500 

1. Over 215 Cuts Per Charge
2. Ability To Cut Through 2-By Material With 1- 11/16" Depth Of Cut
3. Motor Provides 4,700 RPM For Fast, Clean Cutting 
4. 0-50" Bevel Capacity For Greater Cut Variety
5. Spindle Lock And On-Board Wrench Storage For Convenient Blade Changes 

Specifications:

1. Rpm                                  4,700
2. Depth Of Cut At 0"           1-11/16"
3. Depth Of Cut At 45"         1-3/16"
4. Bevel Cut Capacity            0-50"
5. Arbor Size                         3/8" 
6. Blade Size                         5-1/2"     

Includes 

18v 5-1/2" Circular Saw, 18T Carbide Tipped Blade, Hex Wrench And Operators Manual

Missing:  Screw/Wingnut