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 (23a,23b,23c,23d) 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 (23a,23b,23c,23d) 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.