Round Tube Insert Glidestube-plugs-roundRound Ribbed InsertsBlack, white or customized(LDPE) Number D(mm) D(inch) h1(mm) h2(mm) T(mm) More HRY10 10 - 4 11.5 0.8-2.0 details HRY12 12 - 4 11.5 0.8-2.0 details HRY12.7 12.7 1⁄2 4 11.5 0.8-2.0 details HRY13 13 - 4 11.5 0.8-2.0 details HRY14 14 - 5 11.5 1.5-2.0 details HRY15 15 - 5 11.5 0.8-2.0 details HRY16 16 5⁄8 5 11.5 0.8-2.0 details HRY18 18 - 5 11.5 0.8-2.0 details HRY