WLL calculation of square?

i need a answer for calculating working load limit of square plate with 12 mm holes with m10 bolts attached to it and plate attached to the roof with

i need a answer for calculating working load limit of square plate with 12 mm holes with m10 bolts attached to it and plate attached to the roof with bolts. i need to know what the Worling load limit based on 150kg pressure on them

or:i need a answer for calculating working load limit of square plate with 12 mm holes with m10 bolts attached to it and plate attached to the roof with bolts. i need to know what the Worling load limit based on 150kg pressure on them

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