Section 1917.51 - Hand tools(a) Hand tools used by employees shall be maintained in safe operating condition.(b)(1) Hand-held portable electric tools shall be equipped with switches that must be manually held in a closed position to operate the tool.(2) Portable power-driven circular saws shall be equipped with guards above and below the base plate or shoe. The upper guard shall cover the saw to the depth of the teeth, except for the minimum arc needed to permit the base to be tilted for bevel cuts. The lower guard shall cover the saw to the depth of the teeth, except for the minimum arc needed to allow proper retraction and contact with the work. When the tool is withdrawn from the work, the lower guard shall automatically and instantly return to the covering position.(c) Only cutting tools shall be used to cut metal strapping or banding used to secure cargo.