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Dartboard dimensions:
"Double' and 'Treble' rings inside width = 8.0 mm.
'Bull' inside diameter = 12.7 mm.
'25' ring inside diameter = 31.8 mm.
Outside edge of 'Double' ring to centre = 170.0 mm.
Outside edge of 'Treble' ring to centre = 107.0 mm.
Overall dartboard diameter (+/- 3.0 mm.) = 453.0 mm.
'Spider' wire gauge shall be of 18 SWG min. up to 16 SWG max.
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