10mm; Fits Air Arms S400 & S410 & other 10mm barrels
11mm; Fits Crosman ratcatcher / rabbitstopper & other 11mm barrels
15mm; Fits Air Arms S200 & other 15mm barrels
16mm; Fits HW100 & Other 16mm barrels
Slip-on type, approximately 55mm in length including the standard 1/2" UNF male thread. Retained by two grub screws, they add approximately 15mm to the overall length of the barrel. Includes thread protector cap and Allen key.
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