The UK is strange, in that, we use (and supply) materials in both metres and inches.

For those of my visitors that are confused, this is for you...

cm

inches

feet

Quick check...

• 1/32" = .75 mm
• 1/16" = 1.5 mm
• 1/8"  =  3 mm
• 3/16" = 4.5 mm (5 mm)
• 1/4"  =  6 mm
• 1/2"  = 12.5 mm
• 1"   =  25.4 mm