Male Size Kit: 
Collar: inner diameter 13.7cm, height 2cm, thickness 0.7cm
Handcuffs: inner diameter 5.9cm, height 2cm, thickness 0.7cm
Ankle cuffs : inner diameter 8.0cm, height 2cm, thickness 0.7cm

Female Size Kit:
Collar: inner diameter 11.6cm, height 2cm, thickness 0.7cm
Handcuffs: inner diameter 5.2cm, height 2cm, thickness 0.7cm
Ankle cuffs: inner diameter 7.2cm, height 2cm, thickness 0.7cm

Bar length of handcuffs is around 40cm
Bar length of ankle cuffs is around 13cm
Bar length from collar to ankle cuffs is ajustable 36-58cm

Please note that due to all steel gear is handmade,it is unavoidable that a little size error exsits.Around 0.2cm size error on diameter should be accepted.