The HP103000 Collet Set is for use with H.25, H.25H, H.35 and H.35SJ collet-style handpieces. This set adds great versatility as it accomodates burs, drill bits and other accessories with different shank sizes. 
The set includes these 5 collets:
Collet HP103116     1/16"
Collet HP103115     3/32"
Collet HP103114     1/8"
Collet HP103113     3/16"
Collet HP103112     1/4"

Individual collets can be purchased separately. A 3mm collet (HP103124), 4mm collet (HP103126) and 6mm collet (HP103119) are also available separately.