Sizes Listed are [Body Diameter X Grip Range] Large Flange measures 3/8" diameter.  Regular Flange measures 1/4" diameter.

Product Specifications: 1/8" Diameter
POP Rivets (Blind Rivets) Open End
Rivet Diameter: (#4) 1/8" (.125)
Body Diameter: Max 0.128 - Min 0.122
Mandrel Diameter Nominal: 0.076
Flange Diameter Nominal: 0.250-.375 
Head Height Max: 0.040
Shear lbs: 420
Tensile lbs: 530
Hole Size: 0.129 - 0.133
Bit Size: #30
Material: All 304/303 Stainless Steel
USA Made Product
IFI Grade 50
Product Specifications: 5/32" Diameter
POP Rivets (Blind Rivets) Open End
Rivet Diameter: (#5) 5/32" (.156)
Body Diameter: Max 0.159 - Min 0.153
Mandrel Diameter Nominal: 0.095
Flange Diameter Nominal: 0.312
Head Height Max: 0.050
Shear lbs: 650
Tensile lbs: 820
Hole Size: 0.160 - 0.164
Bit Size: #20
Material: All 304/303 Stainless Steel
USA Made Product
IFI Grade 50
**IMPORTANT PLEASE READ: GRIP = The thickness of the material being riveted. The GRIP RANGE is the minimum and maximum grip the rivet is intended to be used with. It is very important to note that the GRIP is NOT the length of the rivet body before it is riveted. GRIP =The length of the rivet body after it is riveted.  The GRIP value represents the maximum thickness of material that the rivet should be used with.  The initial rivet body length starts out longer than the GRIP and is reduced as the rivet is squeezed.