Sizing & Setup
FOBs are designed to fit common arrow diameters (4mm, 5mm, 6mm, and 6.5mm). Sizing is based on your arrow’s diameter.
Match your arrow to the chart below to find the correct FOB size.
ARROW ID
Standard
0.244 – 0.246 INCH (6.5MM)
Arrow ID
S OR GT
Arrow Nock Size
0.310 IN
Max Arrow OD
ARROW NOCK SIZE
FOB SIZE
H-Axis
0.231 – 0.236 INCH (6MM)
Arrow ID
H OR H.E.
Arrow Nock Size
0.300 IN
Max Arrow OD
X-Axis
0.198 – 0.205 INCH (5MM)
Arrow ID
X OR A
Arrow Nock Size
0.284 IN
Max Arrow OD
Micro
0.164 – 0.166 INCH (4MM)
Arrow ID
G OR F
Arrow Nock Size
0.254 IN
Max Arrow OD
MAX ARROW OD
Frequently Asked Questions
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Check its diameter (4mm / 5mm / 6mm / 6.5mm) and match it above
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Check your arrow packaging or manufacturer website
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Email us at contact@fobarchery.com and we’ll help you get it right