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Here is a DIY method to determine the pre-drill size.

Hold the screw and find a drill bit and hold it over the screw (parallel) that visually covers just the body (the inner part) of the screw.

You must fully see the screw threads on both sides.

This depends of the hardness of the material you drill into. For a soft material, use the next smaller drill bit.

Here is a DIY method to determine the pre-drill size.

Hold the screw and find a drill bit and hold it over the screw (parallel) that visually covers just the body (the inner part) of the screw.

You must fully see the screw threads on both sides.

Next choice depends of the hardness of the material you drill into. For a soft material, use the next smaller drill bit.

Here is a DIY method to determine the pre-drill size.

Hold the screw and find a drill and hold it over the screw (parallel) that visually covers just the body (the inner part) of the screw.

You must fully see the screw threads on both sides.

This depends of the hardness of the material you drill into. For a soft material, use the next smaller drill bit.

Here is a DIY method to determine the pre-drill size.

Hold the screw and find a drill bit and hold it over the screw (parallel) that visually covers just the body (the inner part) of the screw.

You must fully see the screw threads on both sides.

This depends of the hardness of the material you drill into. For a soft material, use the next smaller drill bit.

Here is a DIY method to determine the pre-drill size.

Hold the screw and find a drill and hold it over the screw (parallel) that visually covers just the body (the inner part) of the screw.

You must fully see the screw threads on both sides.

This depends of the hardness of the material you drill into. For a soft material, use the next smaller drill.

Here is a DIY method to determine the pre-drill size.

Hold the screw and find a drill and hold it over the screw (parallel) that visually covers just the body (the inner part) of the screw.

You must fully see the screw threads on both sides.

This depends of the hardness of the material you drill into. For a soft material, use the next smaller drill bit.