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We have studied the flux line lattice in YNi 2 B 2 C and LuNi 2 B 2 C, the nonmagnetic end members of the borocarbide superconductors using small angle neutron scattering and transport. For fields, H k c, we find a square symmetric lattice which disorders rapidly above H͞H c2 ϳ 0.2, well below the "peak effect" at H͞H c2 0.9. The results for H͞H c2 , 0.2 can be understood within the collective pinning model, and are controlled by the tilt modulus c 44. For H͞H c2. 0.2, the disordering appears to be associated with the field dependence of the shear modulus, c 66. [S0031-9007(97)03634-X]

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