A turn-secure rack suitable for use with standard automatic capping and decapping devices, for receiving a turn-secure rack compliant screw-capped test tube of length ( l ) and diameter ( d ), said rack comprising: - a top tier , support structure and a bottom tier , said support structure located between said top tier and said bottom tier, said top tier and bottom tier being, when assembled to form said rack , spaced apart a distance smaller than said length ( l ) by said support structure; - said top tier comprising a plurality of apertures of aperture diameter ( da ) larger than said diameter ( d ), said apertures arranged to form a 2-dimensional array of apertures in said top tier, characterised in that - said bottom tier comprises a friction tier and a support tier ; said friction tier facing said top tier when said rack is assembled; - said friction tier comprises a high friction material selected from natural rubber, EPDM rubber, PVC-rubber, structured rubber or silicone, nonslip silicone, nonslip autoclavable silicone, sticky silicone, or is a compression-induce adhesive; - wherein, when said rack is assembled, there is formed an array of rack wells , each rack well comprising an aperture , a well bottom of well bottom diameter ( dw ) larger than said diameter (d), located opposite said aperture , and optionally a well enclosure connecting said well bottom to said aperture either in a straight manner or conically tapering towards said well bottom , such that said aperture diameter (da) may be either larger or of the same diameter as said well bottom diameter ( dw ) ; and - wherein when said rack is assembled, said well bottom is formed from said high friction material comprised in said friction tier . - a top tier , support structure and a bottom tier , said support structure located between said top tier and said bottom tier, said top tier and bottom tier being, when assembled to form said rack , spaced apart a distance smaller than said length ( l ) by said support structure; - said top tier comprising a plurality of apertures of aperture diameter ( da ) larger than said diameter ( d ), said apertures arranged to form a 2-dimensional array of apertures in said top tier, characterised in that - said bottom tier comprises a friction tier and a support tier ; said friction tier facing said top tier when said rack is assembled; - said friction tier comprises a high friction material selected from natural rubber, EPDM rubber, PVC-rubber, structured rubber or silicone, nonslip silicone, nonslip autoclavable silicone, sticky silicone, or is a compression-induce adhesive; - wherein, when said rack is assembled, there is formed an array of rack wells , each rack well comprising an aperture , a well bottom of well bottom diameter ( dw ) larger than said diameter (d), located opposite said aperture , and optionally a well enclosure connecting said well bottom to said aperture either in a straight manner or conically tapering towards said well bottom , such that said aperture diameter (da) may be either larger or of the same diameter as said well bottom diameter ( dw ) ; and - wherein when said rack is assembled, said well bottom is formed from said high friction material comprised in said friction tier . <EOS>